Air cylinder service life and expiration

I have a used but new-to-me P70FT on the way next week. Regarding air cylinder expiration....do people just bin them after 10 years or can they be re-checked or tested in some manner? I see many guys using P70's in various FT and benchrest comps and now I'm wondering about cylinder age and theoretical and practical safety issues. I didn't factor in buying a new cylinder but perhaps I should have. Any experience or advice appreciated.